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Intangible Assets, net
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net
12. Intangible Assets, net

 

Intangible assets as of December 31, 2020 and September 30, 2021 consisted of the followings:

 

   December 31,   September 30, 
   2020   2021 
Computer software at cost  $32,686   $44,634 
Accumulated amortization   (20,879)   (23,216)
   $11,807   $21,418 

 

Amortization expenses were $870 and $1,613 for the three months ended September 30, 2020 and 2021and $3,452 and $4,195 for the nine months ended September 30, 2020 and 2021, respectively.